Action is inactive even immediately after a call to sync_actions

[NickDriscoll]

I'm having an issue where a Pose action is always considered inactive no matter the state of the XR hardware.

This code snippet is from initialization. Just creating an actionset with a single pose action:

Later, we attach the actionset to the session:

This code is in the main loop. I'm calling sync actions with the previously created actionset and just printing out if the controller pose action is active or not:

My application prints "Sync actions returned ok" followed by "false" every frame, regardless of the state of the hardware. I don't know how this can be as I'm calling sync_actions right beforehand. It looks like I'm doing things right by the openxr API itself, so I'm wondering if I'm just using this crate wrong.

Any thoughts would be appreciated.

[Ralith]

How do you expect the OpenXR runtime to know which tracked device's pose you want?

[NickDriscoll]

left_hand_path is constructed from xr::USER_HAND_LEFT

That's how.

[Ralith]

The path passed to Action<Posef>::is_active is a sub-action path. It does not associate the action with a particular device, but disambiguates when an action is associated with multiple devices. The code you've posted does not arrange for binding to any devices at all. You need to configure a binding manually in your OpenXR runtime and/or suggest a default one.